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Constant Capacitance Model Computation of Boron Speciation for Varying Soil Water Content

George E. Brown, Jr. Salinity Laboratory, USDA-ARS, 450 W. Big Springs Road, Riverside, CA 92507

View larger version (22K): [in a new window]   Fig. 1. Effective Kd decreases with decreasing gravimetric water content (g) for saline water composition. Numbers represent textures given in Table 2.

View larger version (13K): [in a new window]   Fig. 2. Variation of H+ concentration and electrical conductivity (EC) with gravimetric water content (g) for saline water composition. Calculated H+ concentration was not affected by variations in soil texture.

View larger version (9K): [in a new window]   Fig. 3. Variation of pH with gravimetric water content (g) for saline water composition.

View larger version (8K): [in a new window]   Fig. 4. Effective Kd at g = 1.5 vs. the intrinsic equilibrium constant K-, for saline water composition.

View larger version (25K): [in a new window]   Fig. 5. Tetrahedral surface B species (SH3BO-4) vs. g for saline water composition. Numbers represent textures given in Table 2.

View larger version (25K): [in a new window]   Fig. 6. Total solution B represented as H3BO3 vs. g for saline water composition. Numbers represent textures given in Table 2.

View larger version (13K): [in a new window]   Fig. 7. Effective Kd vs. g for Soil Texture 1, 60% clay. The three lines represent three different water compositions but identical initial total B.